Numerical aperture of single-mode photonic crystal fibers

2002/02/28 by N. A. Mortensen, N.A. Mortensen, J. R. Folkenberg +4
Engineering · Physics and Astronomy · #Advanced Fiber Optic Sensors #Photonic Crystal and Fiber Optics #Photonic Crystals and Applications #physics.optics

paper · pdf · doi:10.1109/lpt.2002.1021980

published as IEEE Photonics Technology Letters 14, 1094 (2002) · 3 pages including 6 figures. Webpage at http://www.crystal-fibre.com

openalex publication_date 2002/08/01 · arxiv created 2002/08/06 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We consider the problem of radiation into free space from the end-facet of a single-mode photonic crystal fiber (PCF). We calculate the numerical aperture NA = sin /spl theta/ from the half-divergence angle /spl theta/ /spl sim/ tan/sup -1/ (/spl lambda///spl pi//spl omega/) with /spl pi//spl omega//sup 2/ being the effective area of the mode in the PCF. For the fiber first presented by Knight et al. (1996), we find a NA /spl sim/ 0.07 which compares to standard fiber technology. We also study the effect of different hole sizes and demonstrate that the PCF technology provides a large freedom for NA engineering. Comparing to experiments we find good agreement.

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